#include <stdio.h>

int main(void)
{
  long num;
  long sum = 0L;
  _Bool input_is_good;

  printf("Please enter an integer to be summed. (q to quit): \n");
  input_is_good = (scanf("%ld", &num)==1);

  while(input_is_good)
  {
    sum = sum + num;
    printf("Please enter an integer to be summed. (q to quit): \n");
    input_is_good = (scanf("%ld", &num)==1);
  }
  printf("Those integers sum to %ld.\n", sum);
  return 0;
}